_Otto I WELF _______________+
                                                  | (1204 - 1252) m 1228       
                       _Albert I WELF ____________|
                      | (1236 - 1279)             |
                      |                           |_Matilda of ASCANIA ________+
                      |                             (1210 - 1261) m 1228       
 _Henry I WELF _______|
| (1267 - 1322) m 1282|
|                     |                            ____________________________
|                     |                           |                            
|                     |_Adelheid of ALERAMICI ____|
|                       (1242 - 1285)             |
|                                                 |____________________________
|                                                                              
|
|--William WELF 
|  (1298 - 1360)
|                                                  _Henry III WETTIN __________+
|                                                 | (1215 - 1287)              
|                      _Albert II WETTIN _________|
|                     | (1240 - 1314)             |
|                     |                           |_Constantia of BABENBERG ___+
|                     |                             (1212 - 1243)              
|_Agnes of WETTIN ____|
  (1264 - 1332) m 1282|
                      |                            _Frederick II HOHENSTAUFEN _+
                      |                           | (1194 - 1250) m 1235       
                      |_Margaret of HOHENSTAUFEN _|
                        (1241 - 1270)             |
                                                  |_Isabelle PLANTAGENET ______+
                                                    (1214 - 1241) m 1235